scholarly journals Translation-Invariant Bipolarons and Charge Density Waves in High-Temperature Superconductors

2021 ◽  
Vol 9 ◽  
Author(s):  
Victor D. Lakhno
Keyword(s):  
Charge Density ◽  
High Temperature Superconductors ◽  
Bose Condensate ◽  
Density Wave ◽  
Charge Density Waves ◽  
Superconducting Transition ◽  
Density Waves ◽  
Translation Invariant ◽  
Pseudogap Phase ◽  
Pair Density

A correlation is established between the theories of superconductivity based on the concept of charge density waves (CDWs) and the translation invariant (TI) bipolaron theory. It is shown that CDWs are originated from TI-bipolaron states in the pseudogap phase due to the Kohn anomaly and form a pair density wave (PDW) for wave vectors corresponding to nesting. Emerging in the pseudogap phase, CDWs coexist with superconductivity at temperatures below those of superconducting transition, while their wave amplitudes decrease as a Bose condensate is formed from TI bipolarons, vanishing at zero temperature.

scholarly journals Pair-density waves, charge-density waves, and vortices in high- Tc cuprates

2018 ◽  
Vol 97 (17) ◽  
Author(s):  
Zhehao Dai ◽  
Ya-Hui Zhang ◽  
T. Senthil ◽  
Patrick A. Lee
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Density Waves ◽  
High Tc ◽  
Pair Density ◽  
High Tc Cuprates

Epitaxial Growth and Charge Density Wave of TaSe2

1991 ◽  
Vol 230 ◽  
Author(s):  
Toshihiro Shimada ◽  
Fumio S. Ohuchi ◽  
Bruce A. Parkinson
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Epitaxial Growth ◽  
Ultrathin Films ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Charge Density Waves ◽  
Density Waves ◽  
Metal Dichalcogenides

AbstractWe report an epitaxial growth of TaSe2, a family of transition metal dichalcogenides that exhibit Charge Density Waves (CDW). The films that have been characterized with RHEED, LEED, XPS and STM showed two different phases. Occurrence of CDW in the ultrathin films has been detected by XPS and LEED.

scholarly journals High-temperature charge density wave correlations in La1.875Ba0.125CuO4 without spin–charge locking

2017 ◽  
Vol 114 (47) ◽  
pp. 12430-12435 ◽  
Author(s):  
H. Miao ◽  
J. Lorenzana ◽  
G. Seibold ◽  
Y. Y. Peng ◽  
A. Amorese ◽  
...  
Keyword(s):  
High Temperature ◽  
Charge Density ◽  
Density Wave ◽  
Charge Density Waves ◽  
Charge Ordering ◽  
Density Waves ◽  
Spin Correlations ◽  
Spin Order ◽  
Charge Correlations ◽  
Ordering Transition

Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a single conceptual framework. While some systems exhibit stripes of charge and spin, with a locked periodicity, others host charge density waves (CDWs) without any obviously related spin order. Here we use resonant inelastic X-ray scattering to follow the evolution of charge correlations in the canonical stripe-ordered cuprate La1.875Ba0.125CuO4 across its ordering transition. We find that high-temperature charge correlations are unlocked from the wavevector of the spin correlations, signaling analogies to CDW phases in various other cuprates. This indicates that stripe order at low temperatures is stabilized by the coupling of otherwise independent charge and spin density waves, with important implications for the relation between charge and spin correlations in the cuprates.

scholarly journals NOVEL PHENOMENA IN CHARGED BOSE LIQUID

1998 ◽  
Vol 13 (12) ◽  
pp. 987-994 ◽  
Author(s):  
KIMYEONG LEE ◽  
OLEG TCHERNYSHYOV
Keyword(s):  
Charge Density ◽  
Density Wave ◽  
Finite Size ◽  
Charge Density Waves ◽  
Two Dimensions ◽  
Coulomb Interactions ◽  
Density Waves ◽  
Boson Exchange ◽  
Bose Liquid ◽  
Uniform Background

We investigate charged Bose liquid immersed in uniform background charge at zero temperature. Novel phenomena, such as oscillatory shielding of external localized electric charge, rotons and charge density waves (charge stripes in two dimensions), occur in any dimensions. Oscillatory shielding is caused by mixing between scalar boson exchange and Coulomb interactions, which mediate opposite forces. On the other hand, rotons and charge density waves are due to attractive local self-interaction of bosons. Rotons can be regarded as a finite size charge density wave packet without any back flow. We also comment on charge stripes observed recently in cuprates and nickelates.

scholarly journals The Ancient Romans’ Route to Charge Density Waves in Cuprates

2019 ◽  
Vol 4 (2) ◽  
pp. 60 ◽  
Author(s):  
Sergio Caprara
Keyword(s):  
Charge Density ◽  
Density Wave ◽  
Metallic Phase ◽  
Charge Density Waves ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Density Waves ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron

An account is given of the main steps that led the research group in Rome, to which the author belongs, to the formulation of the charge-density-wave scenario for high- T c superconducting cuprates. The early finding of the generic tendency of strongly correlated electron systems with short range interactions to undergo electron phase separation was subsequently contrasted with the homogenizing effect of the long-range Coulomb interaction. The two effects can find a compromise in the formation of incommensurate charge density waves. These charge density waves are inherently dynamical and are overdamped as a consequence of the possibility to decay in electron-hole pairs, yet tend to maintain a (quantum) critical character, which is mirrored in their marked momentum and frequency dependence and in their strong variation with temperature and doping. These dynamical incommensurate charge density waves act as mediators of pairing lading to high- T c superconductivity, and provide the scattering mechanism that produces the observed violation of the Fermi-liquid paradigm in the metallic phase.

scholarly journals Emergent charge order from correlated electron-phonon physics in cuprates

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
S. Banerjee ◽  
W. A. Atkinson ◽  
A. P. Kampf
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Charge Order ◽  
Charge Density Waves ◽  
Charge Ordering ◽  
Momentum Dependence ◽  
Electronic Correlations

Abstract Charge-density wave order is now understood to be a widespread feature of underdoped cuprate high-temperature superconductors, although its origins remain unclear. While experiments suggest that the charge-ordering wavevector is determined by Fermi-surface nesting, the relevant sections of the Fermi surface are featureless and provide no clue as to the underlying mechanism. Here, focusing on underdoped YBa2Cu3O6+x, we propose that charge-density waves form from the incipient softening of a bond-buckling phonon. The momentum dependence of its coupling to itinerant electrons favourably selects the wavevector found in experiments. But, it requires quasiparticle renormalization by strong electronic correlations to enable a unique enhancement of the charge susceptibility near the B1g-phonon selected wavevector. The B1g phonon frequency softens by a few percent, and finite-range charge-density wave correlations will form locally, if nucleated by defects or dopant disorder. These results suggest that underdoped cuprates cannot be understood in the context of strong electronic correlations alone.

scholarly journals Disorder raises the critical temperature of a cuprate superconductor

2019 ◽  
Vol 116 (22) ◽  
pp. 10691-10697 ◽  
Author(s):  
Maxime Leroux ◽  
Vivek Mishra ◽  
Jacob P. C. Ruff ◽  
Helmut Claus ◽  
Matthew P. Smylie ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Charge Density Waves ◽  
Tuning Parameter ◽  
Density Waves ◽  
Pair Density ◽  
The Many ◽  
Tunnel Diode Oscillator ◽  
Dynamic Layer

With the discovery of charge-density waves (CDWs) in most members of the cuprate high-temperature superconductors, the interplay between superconductivity and CDWs has become a key point in the debate on the origin of high-temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order or more elusive pair-density waves (PDWs). Here, we have used proton irradiation to induce disorder in crystals of La1.875Ba0.125CuO4 and observed a striking 50% increase of Tc, accompanied by a suppression of the CDWs. This is in sharp contrast with the behavior expected of a d-wave superconductor, for which both magnetic and nonmagnetic defects should suppress Tc. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La1.875Ba0.125CuO4. Using tunnel diode oscillator (TDO) measurements, we find indications for potential dynamic layer decoupling in a PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu5Ir4Si10.

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